If you are going to stay in D3, the obvious choice is the MIAC. It hasn't been the best conference in D3, but it is arguably the top conference in terms of the percentage of human coaches that are top notch. They have been half Sim AI for the past few seasons so it hasn't been the top conference, but right now they have 10 human coaches after some recruiting efforts. It has a very active message board as well, probably more than any other D3 conference.
The Upstate gives the MIAC a good run for its money and the best overall conference in D3 is the North Atlantic. But neither of those conferences have openings at the moment.
(I'm not in the MIAC so I'm not trying to sell you on a conference that would benefit me in any way ...)